FUTEK VCal Sensor Verification - Manual (Page 61)

Futek Advanced Sensor Technology – Futek VCal™Documentation Rev. 1.8.0 07/26/05
©Futek Advanced Sensor Technology 2005 61
Reproducibility (of results of measurements ) Closeness of the agreement between the results of measurements of the force carried out under changed
conditions of measurement. Includes changing some of those conditions that are held constant for ‘repeatability’, and may refer to measurements carried out
over a long period of time.
Resolution The smallest change in mechanical input which produces a detectable change in the output signal.
.
Safe Overload The maximum load in percent of Rated Capacity that can be applied without producing a permanent shift in performance characteristics beyond
those specified.
Scale Factor The full-scale output minus any offsets, divided by the full-scale load applied.
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Sensor Element of a measuring instrument or measuring chain that is directly or indirectly affected by the measurand.
Shunt Calibration Electrical simulation of transducer output by insertion of known shunt resistors between appropriate points within the circuitry.
Signature Test A type of calibration procedure which involves performing a Primary test under repeatable conditions to establish a sensor’s “signature” (output,
non-linearity, and zero characteristics), so that Subsequent tests may be performed to be compared against this Primary
Signature for performance monitoring and control.
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Span Modulus of the difference between the two limits of a nominal range. (Maximum - Minimum = Span)
Standard Deviation A mathematical quantity used to characterize the dispersion of results.
Strain Gage A measuring element for converting force, pressure, torque etc., into an electrical signal.
Tare The weight of the container in which goods are packaged, and a deduction from the gross weight to compensate for this.
Temperature Shift Span The change in Output due to a change in transducer temperature.
Expressed as a percentage of load per degree Fahrenheit (Celsius) change in temperature. .
Temperature Shift Zero The change in Zero Balance due to a change in transducer temperature.
Expressed as the change in Zero Balance in percent of Rated Output per degrees Fahrenheit (Celsius)
(change in temperature).
Time Test A type of test procedure which involves setting a start and end time for the test, setting limits on viewable outputs (Hi and Lo limits), and setting the
Interval (how often VCal™ is to take and save readings during the duration of the test).
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Uncertainty of Measurement A parameter, associated with the result of a measurement that characterizes the dispersion of values that could reasonably be
attributed to the measurand.
Validation Confirmation by examination and provision of objective evidence that the particular requirements for a specific intended use or purpose are fulfilled
(ISO 8402).
Verification Confirmation by examination and provision of objective evidence that specified requirements have been fulfilled (ISO 8402).
Wheatstone Bridge A network of four resistances, an emf source, and a meter connected such that when the four resistances are matched, the meter will show a
zero deflection or “null” reading.
Zero Balance The output signal of the transducer with rated Excitation and with no-load applied usually expressed in percent of Rated Output.
Zero Offset The difference expressed in degrees between true zero and an indication given by a measuring instrument.
Zero Return The difference in Zero Balance measured immediately before Rated Load application of specified duration, and measured after removal of the load,
and when the output has stabilized.
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Zero Stability The degree to which the transducer maintains its Zero Balance with all environmental conditions and other variables remaining constant.